Carrying scraper



Oct. 29, 1940. GURRlEs 2,219,478

CARRYING SCRAPER Filed Aug. 2, 1938 s Sheets-Sheet 1 r A. G. Gulg a'es ATTORNEY Oct. 29. 1940. A. q GURRIES 7 CARRYING SCRAPER I Filed Au 2, 1938 s Sheets-Sheet 2 INVENTOR A. G. Gurres Oct. 29. 19 A. G. GURRIES CARRYfNG SCRAPER Filed Aug. 2. 1938 5 Sheets-Sheet 3 INVENTOR A G. Gu l'es ATTORN EY Patented Oct. 29, 1940 um'reo STATES PATENT OFFICE CARRYING SCRAPER.

Application August 2,

1 Claim.

This invention relates to a carrying scraper of that general type in which the bowl tilts up at the back for dumping. My principal object is to provide, in a scraper of this type, a dumping front apron or auxiliary bowl mounted separate from the bowl itself so that it may be separately manipulated. This enables the greatest benefits in use to be obtained, since the apron may be operated without disturbing the setting of the bowl in a manner to best aid in the loading of the latter. At the same time, the apron is adapted to cooperate with the bowl so as to form a dirt catching and retaining unit with the bowl, in order that the maximum possible load may be scraped up and hauled to the point of desired dumping.

A further object is to provide what I believe to I be a novel arrangement for controlling the scraping level ofthe front edge of the bowl, which includes skirts or side-wings tending to prevent lateral escape of the dirt as it is pushed ahead of the bowl by the scraping action, and thus better assuring that such dirt will enter the apron and bowl.

These objects I accomplish by means of such structure and relative arrangement of .parts as will fully appear by a perusal of the following specification and claim.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Figure 1 is a side elevation of the scraper as the bowl is adjacent a scraping position.

Figure 2 is a sectional elevation of the scraper with the bowl and apron in carrying position.

Figure 3 is a similar view showing the apron raised to a full dumping position, and with the bowl tilted to a semi-dumping position.

Referring now more particularly to the characters of reference on the drawings, the frame of the scraper comprises side beams I supported by wheels 2 at the rear end. At their forward end the beams are connected by a transverse beam 3, which supports spaced upstanding plates 4. Relatively short beams 5 extend forwardly in converging relation from the top of the plates 4 and at their forward end support a depending post 6, on which the front swivel wheel truck I is mounted.

Disposed between the side beams l intermediate the rear wheels 2 and the cross beam 3 is the scraper bowl, which includes a bottom and back plate 8 terminating in a scraping blade 9, and side plates I 0 which project somewhat ahead of the blade. A pair of straps H converging to their upward ends project upwardly from each side 1938, Serial No. 222,622

are pivoted at their lower ends on the beams l as shown at IS.

A short distance above the blade, the side plates Ill are provided with ears I6, on which are pivoted forwardly extending tension arms ll. At their forward ends, these arms are secured on a transverse shaft l8 disposed between the beams l and supported from the cross beam.3. An arm I9 is secured on the shaft l8, and projects upwardly between the side plates 4, being connected at its upward end to the piston rod 20 of a hydraulic cylinder 2| which at its forward end is pivotally supported from the beams 5 at their forward end, as shown at 22. The position of these parts is such that when the piston 23 of the cylinder is fully retracted as shown in Fig. 2, the blade of the bowl is raised to a carrying position. Skirts or side wings 24 are rigid with and dependent from the arms ll lengthwise thereof, the lower edges of the skirts being substantially alined at the back with the bottom edge of the blade so that when said blade is lowered to a scraping position, the skirts will come close to the ground.

When the bowl is in a scraping or carrying position, the piston of the cylinder !4 is fully retracted, and the bowl is lowered at the back as far as possible, being then well clear of the ground. With the lowering of the blade to a scraping position, the bowl swings both about the shaft l2 and about the cylinder pivots 15 as axes, as indicated in Fig. l in comparison with the carrying position shown in Fig. 2.

Cooperating with the bowl is the front apron, which comprises'a bottom plate 25 which is substantially fiat at its rear end and then curves upwardly, and side plates 26 which overlap the side plates of the bowl inwardly thereof. Upstanding rearwardly curving arms 21 are rigid with the apron, and extend upwardly from inside said apron to a connection with a transverse shaft 28. This shaft is pivoted at a point above the bowl when in carrying position and rearwardly of the front end thereof, on the rear end of extension beams 29, which are rigid with and extend rearwardly from on top of the upper beams 5 on the outside of the arms 21. The spacing of the beams 29 from outside to outside is less than that between the side plates IO, so that they do not interfere with the upward tilting of the bowl to any position. An upstanding arm 30 is rigid with theshaft 28 between the arms 21 and at its upper apron further away from the bowl.

end is connected with the piston rod 3| of another hydraulic cylinder 32. This extends forwardly with a downward slant, and is pivoted at its forward end on a support 33 rigid with and disposed between the frame plates 4. The cylinders 32 and 2| are laterally off-set suflicient to enable the depending arm I! to clear the cylinder 32.

The arrangement of this unit is such that when the apron is in a position to'cooperate with and close the bowl when the latter is in a carry- -ing position, the piston 34 of the cylinder 32 is fully retracted, as shown in Fig. 2. The apron cannot therefore be raised any further in a rearward direction. The advance of the piston in,

the cylinder lowers the rear end of the apron slightly or until the rear edge of the bottom plate 25 of the apron reaches the vertical plane of the shaft 28. From thereon the apron raises causing said bottom plate to move toward a vertical position, so as to discharge the load therefrom by gravity, and at the same time move the Upward movement of the apron is limited by the engagement of the top of the plate 25 with-the extension beams 29 as indicated in Fig. 3. The above described position of the apron pivot relative to the apron makes the latter very easy to discharge, since the load of dirt therein has a tendency to swing the apron forwardly.

I have not shown the necessary flexible piping and control valve assembly for the various hydraulic cylinders, since. such assembly is conventional in most respects. The fluid to the cylinder 2|, however, is intended to be controlled separate from that fed to the cylinders 32 and I4. It is also intended to supply the fluid to the latter cylinders in series, so that the apron tilting cylinder will function first, and the bowl tilting cylinders I4 will only function with the apron reaching its upward limit of movement. This is easy to accomplish, and in fact takes place naturally, since the resistance of the apron either light or loaded is less than that offered by the bowl under corresponding conditions. By means of this arrangement, however, it will be obvious that the apron may be shifted to any desired position without moving the bowl, and also the operating position of the scraping blade may be altered without necessarily changing the position of the apron.

When scraping, the apron is initially swung forward from its bowl closing position, so that some of the dirt churning up in front of the blade with the advance of the scraper and confined by the skirts 24 will pass upwardly into the apron. When the load has been received in the bowl and apron, the bowl is raised to a carrying position by raising the arms l1 and the apron is separately swung back to meet the bowl. These two operations may, of course, be carried out simultaneously, giving a clam-shell closing action and retaining all dirt which has been scraped up.

From the foregoing description it will be readily seen. that I have produced suclra device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claim.

Having thus describedmy invention, what I claim as new and useful and desire to secure by Letters Patent is:

A carrying scraper comprising a wheel supported frame which includes side beams, transversely spaced upstanding elements rigid with the beams at their forward end and a beam unit extending forwardly from the elements at their upper end; a bowl hung between the side beams for swinging movement in a vertical plane, means applied to the bowl at its front end to control such movement and including a transverse shaft journaled in the frame rearwardly of the upstanding elements, an arm rigid with and upstanding from the shaft between the elements and a forwardly extending hydraulic unit connected at its rear end on the upper end of the arm and at its forward end on the beam unit and disposed substantially centrally of the width of the scraper; an apron to cooperate with the front of the bowl, supporting arms upstanding from the apron, a transverse shaft on which the arms are secured at their upper end, frame elements on which the shaft is :lournaled, another arm rigid with and upstanding from the shaft between the apron supporting arms and a forwardly extending hydraulic unit connected at its rear end on the upper end of the last named arm and mounted at its forward end on the beam unit between the upstanding elements and adjacent but to one side of the first named arm.

ALBERT (1. domains. 

